JP3872655B2 - Labyrinth seal structure for constant velocity joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a labyrinth seal structure for a constant velocity joint that seals a connecting portion between a differential output shaft of an automobile and a shaft portion of the constant velocity joint.
[0002]
[Prior art]
Conventionally, for example, a seal device for an axle shaft joint for connecting a differential output shaft of an automobile and an axle shaft has been used (see, for example, Japanese Utility Model Publication No. 7-15785).
[0003]
As shown in FIG. 4, this type of axle shaft joint sealing device includes a labyrinth seal 4 disposed between a boss portion 1 and a differential carrier 3 around a differential output shaft 2. The hollow shaft portion 5 a of the constant velocity joint 5 to be spline-fitted and the differential output shaft 2 are connected by a spring pin 7 inserted into the pin hole 6.
[0004]
The labyrinth seal 4 is provided so that the annular bent portion 9a of the baffle plate 9 attached to the hollow shaft portion 5a of the constant velocity joint 5 faces the annular recess 8 of the differential carrier 3 in a non-contact state. .
[0005]
In this conventional shaft shaft joint sealing device, it is possible to prevent rainwater or the like from entering and prevent the spline fitting portion and the spring pin 7 from being rusted.
[0006]
[Problems to be solved by the invention]
However, when the axle shaft joint sealing device according to the prior art is applied to, for example, the rear wheel of a four-wheel drive vehicle, muddy water splashed by the front wheel is output through the annular recess 8 of the differential carrier 3. There is a risk of intrusion to the periphery of the shaft 2, and there is a desire to further improve the sealing performance.
[0007]
Further, in the seal device for the axle shaft joint according to the prior art, the differential output shaft 2 and the hollow shaft portion 5a of the constant velocity joint 5 are connected via a spring pin 7, and the output shaft 2 and the hollow shaft portion are connected. There is a problem that the work of drilling the pin holes 6 for attaching the spring pins 7 to the 5a is required, and the drilling work becomes complicated.
[0008]
The present invention has been made in consideration of the above-mentioned demands and problems, and can further improve the sealing performance and simplify the assembly work by eliminating the need for a machining operation on the shaft portion of the constant velocity joint. An object of the present invention is to provide a labyrinth seal structure for a constant velocity joint.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a labyrinth seal structure that seals a connecting portion between an output shaft protruding from a differential case and a shaft portion of a constant velocity joint,
The inner ring body press-fitted into the shaft portion of the constant velocity joint, and the outer ring body integrally formed by being fixed to the inner ring body, and extending substantially parallel to the axis of the output shaft The peripheral end portion of the outer ring body is formed so as not to protrude outward from one end portion of the differential case formed in a tapered shape from the radially inner side to the outer side, and is shortened by a predetermined length. ,
The inner ring body is fitted to the outer peripheral surface of the shaft portion and extends in a direction substantially orthogonal to the first annular portion, and a first annular portion extending substantially parallel to the axial direction of the output shaft. A first bent portion and a second bent portion that is further bent from the first bent portion and slightly protrudes substantially parallel to the axial direction of the output shaft. A third bent portion fixed to the first bent portion of the inner ring body via an annular plane, and bent in a direction substantially perpendicular to the third bent portion, and separated from the first annular portion by a predetermined distance. A second annular portion facing each other,
The second annular portion of the outer ring body and the third bent portion of the inner ring body, the lengths of which are opposite to the inner peripheral surface of the differential case and substantially parallel to the axis of the output shaft are opposite to each other. Doo is characterized Rukoto set by the length of the addition.
[0012]
According to the present invention, the inner ring body to which the outer ring body is fixed can be easily assembled by press-fitting along the shaft portion of the constant velocity joint. In addition, the outer end of the outer ring body extending substantially parallel to the axis of the output shaft protrudes outward from one end of the differential case formed in a tapered shape from the inner side to the outer side in the radial direction. A first annular portion that is formed by being shortened by a predetermined length , and that the inner ring body is fitted to the outer peripheral surface of the shaft portion and extends substantially parallel to the axial direction of the output shaft; A first bent portion bent in a direction substantially orthogonal to the first annular portion, and a second bent slightly further along the axial direction of the output shaft by further bending from the first bent portion. A third bent portion fixed to the first bent portion of the inner ring body via an annular flat surface, and the third bent portion. The second annular part bent in a substantially orthogonal direction and opposed to the first annular part at a predetermined interval. The second annular portion of the outer ring body and the third ring of the inner ring body, the lengths of which are opposed to the inner peripheral surface of the differential case and are substantially parallel to the axis of the output shaft are opposite to each other. the Rukoto set by the length of the bent portion are added, along the outer ring member to prevent the muddy water or the like is induced, the sealing performance is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the labyrinth seal structure for a constant velocity joint according to the present invention will be described in detail below with reference to the accompanying drawings.
[0014]
In FIG. 1, reference numeral 10 indicates a rotational driving force transmission mechanism in which the labyrinth seal structure according to the present embodiment is applied to a connection portion between the differential device and the constant velocity joint.
[0015]
The rotational driving force transmission mechanism 10 is connected to a differential case 12 (hereinafter referred to as a differential case 12) constituting a differential device and a differential gear mechanism (not shown) disposed in the differential case 12 to transmit rotational driving force. And a constant velocity joint 18 that is spline-fitted to one end of the output shaft 14 via first and second stopper rings 16a and 16b.
[0016]
The constant velocity joint 18 includes a cup portion 20 formed in a thick bottomed cylindrical shape, and a hollow shaft portion 22 formed integrally with the cup portion 20, and the hollow shaft portion 22. The spline portion formed on the inner peripheral surface of the output shaft and the spline portion formed on the outer peripheral surface of the output shaft 14 are fitted to form a spline fitting portion 24.
[0017]
Between the output shaft 14 and the cylindrical portion 26 of the differential case 12 extending substantially parallel to the axis of the output shaft 14, the output shaft 14 is rotatably supported with respect to the fixed differential case 12. A bearing member 28 and an oil seal 32 having a pair of divided lip portions 30a and 30b surrounding the inner peripheral surface of the output shaft 14 and fixed to the inner peripheral surface of the cylindrical portion 26 of the differential case 12 are arranged. It is installed.
[0018]
Further, a first labyrinth seal portion 34 a and a second labyrinth seal portion 34 b are arranged substantially in parallel along the axial direction of the output shaft 14 between the cylindrical portion 26 of the differential case 12 and the output shaft 14. A labyrinth seal structure 36 is provided.
[0019]
As shown in FIGS. 2 and 3, the first labyrinth seal portion 34 a is fixed to the inner ring body 38 and the inner ring body 38 that is press-fitted into the outer peripheral surface of the hollow shaft portion 22 of the constant velocity joint 18. The outer ring body 40 is integrally formed. The inner ring body 38 is fitted to the outer peripheral surface of the hollow shaft portion 22 and extends substantially parallel to the axial direction of the output shaft 14, and is substantially orthogonal to the first annular portion 42. A first bent portion 44 that is bent in the direction to be bent, and a second bent portion 46 that is further bent from the first bent portion 44 and slightly protrudes along the axial direction of the output shaft.
[0020]
On the other hand, the outer ring body 40 is substantially orthogonal to the third bent part 48 and a third bent part 48 fixed to the first bent part 44 of the inner ring body 38 via an annular plane. A second annular portion 50 that is bent in the direction and faces the first annular portion 42 at a predetermined interval.
[0021]
In this case, as shown in FIG. 2, the second annular portion 50 of the outer ring body 40 and the inner peripheral surface of the cylindrical portion 26 of the differential case 12 are formed to be spaced apart from each other by a predetermined distance. The end portion 50a does not protrude outward from the one end portion 26a of the cylindrical portion 26 of the differential case 12, and the length along the substantially horizontal direction is shortened by the length A.
[0022]
The length along the substantially horizontal direction of the first labyrinth seal portion 34 a facing the cylindrical portion 26 of the differential case 12 is such that the second annular portion 50 of the outer ring body 40 and the second bent portion 46 of the inner ring body 38. Are set to a length B obtained by adding.
[0023]
Further, the first labyrinth seal portion 34a is formed with an annular recess 51 that is surrounded by the first annular portion 42, the second annular portion 50, and the third bent portion 48 and functions as a space for guiding muddy water or the like. .
[0024]
The second labyrinth seal portion 34b is made of a rubber material or a resin material, and has a first lip portion 52a protruding along a substantially horizontal direction and a second lip portion 52b slidably contacting the outer peripheral surface of the hollow shaft portion 22. The inner metal piece 54 is attached to the inner peripheral surface of the cylindrical portion 26 of the differential case 12.
[0025]
The rotational driving force transmission mechanism 10 to which the labyrinth seal structure 36 according to the embodiment of the present invention is applied is basically configured as described above. Next, the operation and effects thereof will be described.
[0026]
The rotational driving force applied to the differential device under the driving action of an engine (not shown) is transmitted to the constant velocity joint 18 via the output shaft 14, and the output shaft 14 and the constant velocity joint 18 are integrally formed in a predetermined direction. Rotate. The rotational driving force is further transmitted to a front wheel or a rear wheel via a drive shaft (not shown).
[0027]
When the output shaft 14 and the constant velocity joint 18 rotate integrally, the output shaft 14 and the constant velocity joint 18 are sealed by a labyrinth seal structure 36 including a first labyrinth seal portion 34a and a second labyrinth seal portion 34b. For example, muddy water or the like splashed up by the front wheel is guided into the annular recess 51 of the first labyrinth seal portion 34a, and rainwater, dust and the like are prevented from entering the output shaft 14 side.
[0028]
In the present embodiment, the first annular portion 42 of the first labyrinth seal portion 34a can be easily assembled by press-fitting along the hollow shaft portion 22 of the constant velocity joint 18, and the constant velocity joint 18 can be hollow. A drilling operation or the like for mounting the first labyrinth seal portion 34a on the shaft portion 22 becomes unnecessary. Therefore, in this embodiment, the assembling work can be simplified and the manufacturing cost can be reduced.
[0029]
Further, in the present embodiment, by setting the length B along the horizontal direction substantially parallel to the axis of the output shaft 14 to be large, for example, rain water, muddy water, or the like splashed by the front wheels or the like enters the output shaft side. This is prevented and the sealing performance can be improved.
[0030]
Furthermore, in the present embodiment, the peripheral end surface 50a of the second annular portion 50 facing the cylindrical portion 26 of the differential case 12 does not protrude beyond the one end portion 26a of the cylindrical portion 26 of the differential case 12, and the second annular portion 50 The peripheral end portion 50a of the cylindrical portion 26 is formed to be shorter than the one end portion 26a of the cylindrical portion 26 by a length A, so that rainwater is transmitted from the inner peripheral surface of the cylindrical portion 26 to the second annular portion 50. And the like can be prevented from entering.
[0031]
In other words, when the peripheral end portion 50a of the second annular portion 50 is formed to have the same length or projecting as the one end portion 26a of the differential case 12, muddy water or the like is output on the outer peripheral surface of the second annular portion 50 as a guide surface. This is because it is easy to enter the 14 side.
[0032]
Furthermore, in the present embodiment, the sealing performance can be further improved by arranging the first labyrinth seal portion 34a and the second labyrinth seal portion 34b substantially in parallel along the axial direction of the output shaft 14. .
[0033]
Furthermore, in the present embodiment, the first labyrinth seal portion 34a is configured by adhering two parts of the inner ring body 38 and the outer ring body 40 each having a simple shape, thereby reducing the weight. .
[0034]
Furthermore, by applying the labyrinth seal structure 36 according to the present embodiment to the rear wheel of a four-wheel drive vehicle, a sealing function that prevents muddy water or the like splashed up by the front wheel from entering the periphery of the output shaft 14. Can be suitably exhibited.
[0035]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0036]
In other words, the inner ring body to which the outer ring body is fixed can be easily assembled by press-fitting along the shaft portion of the constant velocity joint, so that the processing of the shaft portion of the constant velocity joint becomes unnecessary, and the assembly work is simplified and manufactured. Cost can be reduced.
[0037]
Further, the peripheral end portion of the outer ring body extending substantially parallel to the axis of the output shaft is formed so as not to protrude outward from one end portion of the differential case, but to be shortened by a predetermined length. Thus, it is possible to prevent the muddy water and the like from being guided along the outer ring body, and to further improve the sealing performance.
[Brief description of the drawings]
FIG. 1 is a partially omitted longitudinal sectional view of a rotational driving force transmission mechanism to which a labyrinth seal structure according to an embodiment of the present invention is applied.
FIG. 2 is a partially enlarged longitudinal sectional view of the labyrinth seal structure shown in FIG.
FIG. 3 is a partially cutaway perspective view of a first labyrinth seal portion according to the labyrinth seal structure.
FIG. 4 is a partially omitted vertical cross-sectional view of a conventional axle shaft joint sealing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Rotary drive force transmission mechanism 12 ... Differential case 14 ... Output shaft 18 ... Constant velocity joint 22 ... Hollow shaft part 26 ... Cylindrical part 26a ... One end part 34a, 34b ... Labyrinth seal part 36 ... Labyrinth seal structure 38 ... Inner ring body 40 ... Outer ring body 42, 50 ... Annular part 44, 46, 48 ... Bent part 50a ... Peripheral end part 51 ... Annular recessed part 52a, 52b ... Lip part

Claims (1)

A labyrinth seal structure that seals the connection portion between the output shaft protruding from the differential case and the shaft portion of the constant velocity joint,
The inner ring body press-fitted into the shaft portion of the constant velocity joint, and the outer ring body integrally formed by being fixed to the inner ring body, and extending substantially parallel to the axis of the output shaft The peripheral end portion of the outer ring body is formed so as not to protrude outward from one end portion of the differential case formed in a tapered shape from the radially inner side to the outer side, and is shortened by a predetermined length. ,
The inner ring body is fitted to the outer peripheral surface of the shaft portion and extends in a direction substantially orthogonal to the first annular portion, and a first annular portion extending substantially parallel to the axial direction of the output shaft. A first bent portion and a second bent portion that is further bent from the first bent portion and slightly protrudes substantially parallel to the axial direction of the output shaft. A third bent portion fixed to the first bent portion of the inner ring body via an annular plane, and bent in a direction substantially perpendicular to the third bent portion, and separated from the first annular portion by a predetermined distance. A second annular portion facing each other,
The second annular portion of the outer ring body and the third bent portion of the inner ring body, the lengths of which are opposite to the inner peripheral surface of the differential case and substantially parallel to the axis of the output shaft are opposite to each other. a labyrinth seal structure for a constant velocity joint, wherein Rukoto set by the length of bets is added.

Images